Electrically-heated oven.



L. G. CQPEMAN. ELECTRICALLY HEATED oven. APPLICATIONFILED JAN. 23. 19H- Patented J une l, 1915.

m W X to be performed.

UNITED STATES PATENT OFFICE.

morn anon" COPEMAN,

Specification of Letters Patent.

Patented J une 1, 1915.

Application filed January 23, 1914. Serial No. 813,935.

It is a further object to provide'a means of mechanical and electrical attachment which requires no skill on the part of the operator in shifting the unit and in which there is no danger of short circuits, either during the shifting of the unit or bythe spilling of liquid or food upon. the contacts.

With these objects in View, the invention consists in various features of construction as hereinafter set forth.

In the drawings: Figure 1 is a vertical longitudinal section through the oven, showing in full lines the heating unit in its u of adjustment, and in dotted lines in a lower position; Fig. 2 is a perspective View of the unit and the attachment socket therefor; and Fig. 3 is a cross section showing the manner of supporting the unit in its upper position.

n the operation of the heat to the upper portion of the chamber by internal convexation of the air. For certain operations, however, such as broiling, t e arrangement of the unit at the top of the chamber is preferable. proved construction I provide means for exchangeably positioning the unit at either the top or the bottom of the oven chamber, and I further provide mechanical and electrical connections which may be readily engaged or disengaged in either position.

In detail, A is an oven chamber of any suitable construction, and which is normally closed by a tight-fitting door B.

C is the electrical heating unit, preferably in the form of a rectangular plate for covthe top or bottom of the oven. As shown, the unit is formed by a naked resistor D, which is wound in a coil or spiral and arranged in grooves E formed in an insulator plate F.. This plate is formed of any suitable insulating material As illustrated circuits and ject from the portion J of the frame and are insulated by mounting in a projecting por tion L of the insulator plate F. The terminal contacts K are adapted to engage with socket contacts M andv an insulator socket member N, the latter being arranged on one of the vertical walls of the oven casing.

With the construction as described the unit C may be placed in operative position by inserting the contacts K into the sockets M, there being provided two of said sockets, one located adjacent to the bottom and the other adjacent to the top of the provided with two the lower position the frame H of the unit Wlll be supported upon the bottom by the legs I which rest thereon, while a heat-insulating air space is left between the bottom of the unit and the oven bottom. In the upper position of adjustment the legs I ear against the top of and are supported by a hooked engagement Wit supporting lugs or bearings 0. Thus this upper position the unit is inverted and the heat generated in the resistor is radiated directly downward upon the work therebeneath.

The arrangement of the terminal contacts as projecting laterally from the unit and engaging sockets in the vertical wall of the dvantageous over constructions in lower position of the unit is raised above three terminals K, which prothe oven chamber Another advantage of the construction: is that the same unit is used for either the of an electrical heating bottom or the top of the oven, and by making this unit reversible, direct radiation from the resistor is possible in each position. Also the reversing of the unit will bring the legs at the top in the upper position, and will form a heat-insulating air space between the unit and the oven lining in the same manner as is the case at the bottom.

What I claim as my invention is:

.1. The combination with an oven casing of a reversible electrical heating unit, and means'for mechanically and electrically engaging said unit respectively adjacent to the top-and the bottom of said oven casing and in reverse positions. 7

2. The combination with an oven casing unit in the form of a hot plate adapted to directly 'radiate the generated heat from one side only, said plate having an exposed naked resistor in one surface thereof, and means for mechanically and electrically connecting said hot'plate in reverse positions "adjacent respectively to the top and bottom of said oven casing.

3. The combination with an oven casing of a detachable electrical heating unit comprising an insulator s-pporting plate, a resistor mounted thereon, legs projecting from said plate on the opposite side from said resistor, and means for reversibly, cally and electrically engaging said unlt with its legs bearing respectively upon the bottom and against the top of the oven casis no danger of fouling.

' porting said heating mechani- 1 ing to form a heat-insulating air space between said unit and oven casing in each position.

4'. The combination with an oven casing, of an electrical heating unit provided with projecting terminal contacts, socket terminal contacts mounted on a vertical wall of the oven casing adapted to detachably engage said projecting terminal contacts, said socket contacts being positioned respectively near 'the oven casing top and said projecting terminal contacts when said heating unit is positioned respectively at the top and the bottomof said oven casing and in reverse positions.

5. The combination with an oven casing, of a .combined reversible electrical heating unit and stand, and means for detachably, mechanically and 'lectrically engaging said combined unit and'stand adjacent to the top and bottom of said oven heat-insulating air space between said unit and stand and oven casing in each position.

6. The combination with an oven casing, of an'electric'al heating unit, a frame. supunit provided with a plurality of legs, and means for detachably engaging said legs and electrically/connect- 'ing said heating unit adjacent to the top and bottom of said -oven casing and in reverse positions.

In testimony whereof I aflix, my signature in presence of'two witnesses. I

' LLOYD'GROFF QOPEMAN.

.' Witnesses:

Ber W. ScHUMAcHnR, 'BERTHA SHIEPNER.

bottom to engage casing to form a 

